Response of the Weed Maryland Meadowbeauty (Rhexia mariana L.) and Blueberry to Flumioxazin PRE

Figures & data

Table 1. Effect of flumioxazin on Maryland meadowbeauty control in non-bearing blueberry 30, 60, and 90 DAT averaged across locations at Harrells and Burgaw, NC in 2008.

	Maryland meadowbeauty
Flumioxazin, kg ai ha^–1	30 DAT^z	60 DAT	90 DAT
	% control
0.21	97	96	92
0.28	94	96	92
0.35	96	97	93
0.42	94	98	97
0.49	97	100	97
LSD (0.05)	NS	NS	NS

^zAbbreviations: DAT, days after treatment; NS, not significant.

Table 2. Effect of flumioxazin PRE on Maryland meadowbeauty control in bearing blueberry 30, 60, and 90 DAT^z (at harvest) at Harrells and Burgaw, NC.

	Maryland meadowbeauty
	Harrells			Burgaw
Rate, kg ai ha^–1	30 DAT	60 DAT	90 DAT	30 DAT	60 DAT	90 DAT
	% control
0.21	97	77	46	100	94	53
0.28	98	77	53	100	94	68
0.35	98	82	60	100	95	76
0.42	98	87	88	100	91	79
0.49	99	90	84	100	94	84
0.56	98	93	88	100	94	86
0.63	99	94	88	100	93	83
0.70	99	95	91	100	92	86
0.76	98	94	93	100	98	90
LSD (0.05)	NS	6	20	NS	NS	8

^zAbbreviations: DAT, days after treatment; NS, not significant.

Table 3. Meadowbeauty control by flumioxazin applied Early PRE or Early PRE followed by Late PRE (60 DAT) at Harrells and Burgaw, NC in 2008.

	Meadowbeauty
			Harrells			Burgaw
Herbicide	Rate, kg ai ha^–1	Timing^z	30 DAT^y	60 DAT	At harvest	30 DAT	60 DAT	At harvest
			% control
Nontreated	0		0	0	0	0	0	0
Flumioxazin	0.21	a	98	77	34	100	99	97
Flumioxazin	0.28	a	100	79	49	100	99	92
Flumioxazin	0.35	a	99	86	63	100	99	83
Flumioxazin	0.42	a	99	88	81	100	99	92
Flumioxazin	0.21	a + b	98	76	98	100	99	99
Flumioxazin	0.28	a + b	97	76	96	100	99	99
Flumioxazin	0.35	a + b	100	86	100	100	99	99
Flumioxazin	0.42	a + b	100	88	99	100	99	99
Hexazinone	4.73	a	21	11	22	100	98	76
Hexazinone	9.46	a	25	19	13	100	99	90
LSD (0.05)			7	15	22	1	1	9

^zTiming: a, single application applied Early PRE; a + b, sequential application of Early PRE followed by Late PRE (60 DAT).

^yAbbreviations: DAT, days after Early PRE application. At harvest evaluation is approximately 90 d after Early PRE application and 30 d after Late PRE application.

Table 4. Comparison of blueberry yield of the flumioxazin applied Early PRE or Early PRE followed by Late PRE (60 DAT) treatments at Burgaw and Harrells, NC with mean yield reported by the state of North Carolina.

	Blueberry yield
Location	Single,^z kg ha^–1	Sequential, kg ha^–1
Harrells	3150	3551
Burgaw	6065	5735
LSD (0.05)	788	828

^zAbbreviations: Early PRE, single PRE application of flumioxazin; Early PRE fb Late, sequential applications of flumioxazin Early and Late PRE.